Habitat selection of larval Gomphus graslinii and Oxygastra curtisii (Odonata: Gomphidae, Corduliidae)
International Journal of Odonatology, Volume 4, Issue 1, Pages 23-34, 2001
Published: 1 April 201 (Received: 4 August 2000, Accepted: 20 February 2001)
The microdistribution patterns of larval Gomphus graslinii and Oxygastra curtisii in three rivers in southern France were studied. While G. graslinii was caught mainly in sandy reaches covered with leaf litter, O. curtisii was found almost exclusively clinging to alder roots at the river margins. Preferences of habitat structure were determined from habitat selection experiments under outdoor conditions with four types of substrates: (I) gravel, (II) sand, (III) sand covered with leaves, and (IV) alder roots. G. graslinii preferred substrate types III and II over I and IV; O. curtisii preferred IV and III over I and II.
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